Kovid,
I went to
http://bazaar-vcs.org/MacOSXBundle and I was able get a .dmg file that installed bzr. But when I attempted to download calibre source it errored out with an out of memory error. I have posted a bug report as directed and am waiting for an answer. This type of error has been problem in a few other programs under Leopard. Sigh!
I have also gone to whatismyip.com and did a fetch of my IP. I am shocked at how much info they can gather on an individuals system. So much so that I am reluctant to post on a public board. Part of the report concerns the characteristics of the browser being used. In that part of the report it shows:
Remote Port: 14027
If this is of any help in figuring out why I cannot download a feed please let me know. If you would like to take a look at the full report please tell me how to get it to you without posting it on a public board.